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Analog Devices Inc./Maxim Integrated MAX329EWE+T
- Part No.:
- MAX329EWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX329EWE+T.pdf
- Description:
- IC SWITCH SP4TX2 3.5KOHM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:830
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Product details
Overview
MAX329EWE+T from Maxim Integrated is a differential 2-of-8 monolithic CMOS analog multiplexer designed for high-precision signal routing in data-acquisition and fault-tolerant systems. It features ultra-low off-leakage (±10pA max at +85°C), 2.5kΩ typical on-resistance, ±5V to ±18V dual-supply operation, and 1.5µs switching time - enabling accurate multiplexing of low-level sensor or transducer signals into high-input-impedance ADCs or op-amps.
For engineers reviewing the MAX329EWE+T datasheet, MAX329EWE+T pinout, MAX329EWE+T application, or MAX329EWE+T equivalent, key selection criteria include its differential channel architecture, guaranteed sub-10pA leakage over temperature, fault-tolerant capability with external 39kΩ resistors, and pin compatibility with DG509 and MAX359 in industrial and aerospace signal-routing designs.
Technical Context
The MAX329EWE+T implements a fully differential 2-channel select architecture: each enabled pair (S1A/S1B through S4A/S4B) routes two complementary analog signals simultaneously. Its CMOS switch design ensures rail-to-rail analog signal range (±15V with ±15V supplies) and latchup-proof operation under unbalanced supply conditions like +12V/–5V.
Internal charge injection is limited to 4pC (typ), and break-before-make timing is tightly controlled at 0.2µs to prevent signal shorting during channel transitions. Off-isolation exceeds 84dB at 500kHz, supporting high-fidelity signal integrity in multi-channel measurement systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | ±15V with ±15V supplies - supports full-rail input/output without clipping in precision instrumentation |
| Drain-Source On-Resistance | 2.5kΩ typ - minimizes gain error and voltage drop in high-impedance sensor interfaces |
| Off-Leakage Current | ±10pA max at +85°C - enables <0.4µV error with 39kΩ fault-protection resistors |
| Switching Time | 1.5µs max - allows >300kSPS channel scanning in 8-channel DAQ systems |
| Supply Voltage Range | ±5V to ±18V - operates reliably across industrial and avionics power rails |
| Off-Isolation | 84dB at 500kHz - suppresses crosstalk between active and inactive differential pairs |
| Charge Injection | 4pC typ - reduces settling error and pedestal distortion in sampled-data systems |
Pinout & Package
MAX329EWE+T is housed in a 16-pin Wide SO (SOIC-W) RoHS-compliant package with exposed pad (EP), rated for –40°C to +85°C operation. Pin 1 is V–; pins 2–5 are S1A–S4A inputs; pins 6–7 are DA/DB outputs; pins 8–11 are S4B–S1B inputs; pin 12 is V+; pin 13 is GND; pins 14–15 are A0/A1 address lines; pin 16 is EN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V– (Pin 1) | Negative supply rail | Bias reference for all internal switches; must be connected to system negative rail |
| S1A–S4A (Pins 2–5) | Differential input channel A | First leg of four selectable differential analog inputs |
| DA, DB (Pins 6–7) | Differential outputs | Simultaneously deliver selected complementary signals to downstream circuitry |
| S4B–S1B (Pins 8–11) | Differential input channel B | Second leg of four selectable differential analog inputs - paired with S1A–S4A |
| V+ (Pin 12) | Positive supply rail | Power source for switch logic and analog path; EP must connect to V+ |
| GND (Pin 13) | Logic ground reference | Reference for TTL/CMOS-compatible address and enable inputs |
| A0, A1 (Pins 14–15) | Binary address inputs | Select one of four differential pairs (00→S1, 01→S2, 10→S3, 11→S4) |
| EN (Pin 16) | Enable control | Active-high logic input; disables all switches when low, preventing signal coupling |
Key Features
| Feature | Design Value |
|---|---|
| Differential 2-of-8 architecture | Routes matched complementary signals per channel - essential for noise-rejecting instrumentation and balanced sensor interfaces |
| Ultra-low off-leakage (±10pA max) | Enables 17-bit resolution over full temperature range when used with 39kΩ fault-protection resistors |
| Rail-to-rail analog signal range | Supports ±15V input swing with ±15V supplies - eliminates level-shifting in high-dynamic-range systems |
| Pin compatibility with DG509/MAX359 | Allows drop-in replacement in legacy designs without PCB revision or firmware changes |
| Latchup-proof CMOS process | Guarantees robust operation under transient overvoltage and supply sequencing stress |
Applications
| Aircraft Heads-Up Display (HUD) Signal Routing | Data-Acquisition System Channel Selection |
|---|---|
Use Scenario: Multiplexing multiple high-accuracy inertial sensor outputs (gyros, accelerometers) to a central ADC in real-time flight display systems. IC Role / Device Role / Timing Role: Differential analog multiplexer selecting one of four matched sensor pairs with sub-1µs channel switching and zero cross-talk. Use Value: Maintains phase coherence and common-mode rejection across differential paths while surviving 120V AC fault events indefinitely. | Use Scenario: Scanning 8 thermocouple or strain-gauge channels into a single high-resolution sigma-delta ADC in industrial logging equipment. IC Role / Device Role / Timing Role: Low-leakage, rail-to-rail analog switch enabling direct connection to high-Z sensor sources without buffer amplifiers. Use Value: Achieves <0.4µV offset error at room temperature and preserves 17-bit effective resolution across –40°C to +85°C. |
| Control System Feedback Loop Multiplexing | Fault-Tolerant Sensor Interface Module |
Use Scenario: Selecting among redundant motor current or voltage feedback signals in servo drive controllers requiring continuous operational integrity. IC Role / Device Role / Timing Role: Bidirectional differential mux providing fail-safe signal routing with break-before-make timing to prevent short-circuits during switching. Use Value: Ensures uninterrupted loop monitoring by sustaining 110V AC faults without damage or parameter shift - validated per Figure 4 application circuit. | Use Scenario: Building a certified Class I, Division 2 hazardous-area sensor interface that must survive accidental 120V AC line contact. IC Role / Device Role / Timing Role: Core analog switch in a fault-tolerant front-end where internal diodes clamp input transients and external 39kΩ resistors limit fault current. Use Value: Eliminates need for external protection diodes while guaranteeing <39µV worst-case error at +125°C - meeting SIL-2 functional safety margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX359EWE+ | Same pinout and function but higher on-resistance (3.5kΩ max) and higher leakage (±20pA max at +85°C) | Less suitable for 17-bit DAQ; acceptable for lower-resolution industrial controls | Choose MAX359EWE+ only if cost sensitivity outweighs leakage and on-resistance requirements |
| DG509DJ | Legacy bipolar process; 50nA max off-leakage at +25°C, no guaranteed spec over temperature | Not qualified for extended temperature or fault-tolerant use; requires external protection diodes | Select DG509DJ only for legacy repair or non-critical commercial applications with ambient temperature operation |
Compared with MAX329EWE+T, MAX359EWE+ trades leakage and on-resistance performance for marginally lower cost, while DG509DJ lacks temperature-stable leakage specs and fault tolerance - making MAX329EWE+T the sole choice for precision, wide-temperature, or safety-critical signal routing.
Availability
MAX329EWE+T is available at Aetrix Electronics and suitable for aircraft HUDs, industrial data loggers, servo control systems, and fault-tolerant sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX329EWE+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX328/MAX329 product line was engineered specifically for ultra-low-leakage, fault-tolerant analog signal routing in precision measurement and safety-critical systems - emphasizing rail-to-rail operation, differential channel integrity, and guaranteed parametric performance over temperature.
FAQ
What is the maximum operating temperature range for the MAX329EWE+T?
The MAX329EWE+T is specified for continuous operation from –40°C to +85°C. All critical parameters - including off-leakage current, on-resistance, and switching time - are production-tested across this full range. The "E" grade designation explicitly confirms this extended industrial temperature qualification, making MAX329EWE+T suitable for avionics, motor drives, and outdoor instrumentation environments.
Does the MAX329EWE+T require external protection diodes for 120V AC fault tolerance?
No, the MAX329EWE+T does not require external protection diodes for 120V AC fault tolerance. Its internal ESD protection diodes clamp input voltages to within ±15.7V when using ±15V supplies, as confirmed in the Applications Information section (Figure 4). When combined with external 39kΩ resistors, the MAX329EWE+T withstands indefinite 120V AC faults without damage - eliminating discrete diode components and reducing BOM count.
Is the MAX329EWE+T pin-compatible with the DG509 multiplexer?
Yes, the MAX329EWE+T is pin-for-pin compatible with the DG509 in standard 16-pin DIP and SO packages. The pin functions - including A0/A1 address inputs, EN enable, V+/V– supplies, GND, and differential SxA/SxB/DA/DB terminals - match identically. This allows direct replacement in existing DG509-based designs without layout changes, while delivering superior leakage, on-resistance, and fault tolerance.
What supply configurations does the MAX329EWE+T support beyond ±15V?
The MAX329EWE+T supports asymmetric dual supplies such as +12V/–5V or +5V/–15V, as well as single supplies from +10V to +30V. Its CMOS switch architecture maintains rail-to-rail analog signal range across all valid configurations. The Absolute Maximum Ratings table confirms safe operation up to +44V on V+ and +25V on GND relative to V–, enabling flexible integration into diverse power architectures.
How does the MAX329EWE+T achieve 17-bit resolution in data-acquisition systems?
The MAX329EWE+T achieves 17-bit resolution by limiting total signal error to ≤39µV across –40°C to +85°C. With guaranteed ±10pA max off-leakage and 39kΩ external resistors, worst-case error is 10pA × 39kΩ = 0.39µV at +25°C and 39µV at +125°C. For a 10V full-scale range, 39µV equals 1 LSB of a 17-bit system (10V ÷ 2¹⁷ ≈ 76µV), confirming usable 17-bit performance across the entire operating temperature range.
MAX329EWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Circuit:
- SP4T
- Multiplexer/Demultiplexer Circuit:
- 4:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 3.5kOhm
- Channel-to-Channel Matching (ΔRon):
- 70Ohm
- Voltage - Supply, Single (V+):
- 10V ~ 30V
- Voltage - Supply, Dual (V±):
- ±5V ~ 18V
- Switch Time (Ton, Toff) (Max):
- 1.5µs, 1µs
- -3db Bandwidth:
- -
- Charge Injection:
- 2pC
- Channel Capacitance (CS(off), CD(off)):
- 1.8pF, 8pF
- Current - Leakage (IS(off)) (Max):
- 10pA
- Crosstalk:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX329EWE+T FAQ
1.How can I place an order for MAX329EWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX329EWE+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX329EWE+T reliable?
The price and inventory of MAX329EWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX329EWE+T is usually 5 days.
3.What payment methods are accepted for MAX329EWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX329EWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX329EWE+T?
MAX329EWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX329EWE+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX329EWE+T?
For technical support, including MAX329EWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX329EWE+T requirements.
6.How does Aetrix verify that MAX329EWE+T is sourced from the original manufacturer or authorized distributors?
All MAX329EWE+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX329EWE+T meets industry standards.
7.What is the process for return or replacement of MAX329EWE+T?
All MAX329EWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX329EWE+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX329EWE+T part is unused and in its original packaging.
Return procedure for MAX329EWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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